Combined spring rock-drilling machine



UNITED STATES PATENT OFFICE.

SAMUEL JACK, 2D, OF RICHMOND, MAINE.

COMBINED SPRING ROCK-DRILLING MACHINE.

Specification of Letters Patent No. 6,073, dated January 30, 1849.

To all whom t may concern.:

Be it known that I, SAMUEL JACK, 2d, of Richmond, in the county ofLincoln and State of Maine, have invented a new and useful Improvementin Machinery for Drilling Holes in Rocks and I dohereby declare that thesame is fully described and represented in the following specificationand accompanying drawings, letters, figures, and references thereof.

Of the said drawings Figure l denotes a top view of my improved drillingmachine. Fig. 2 is a side elevation of it; Fig. 8, a vertical centraland longitudinal section of it, and Fig. 4 a transverse and verticalsection of it.

In the said drawings A denotes a vertical shaft or drill holder having asocket made in its lower end for the reception and re tention of a drillB, which may be confined in place by a clamping screw C, or any othersuitable contrivance. The said drill shaft or holder is supported by andat the front ends of two long parallel springs D, E, which arerespectively sustained by two elliptic springs F, G, or H, I, arrangedas seen in the drawings, there being one of said springs placed aboveeach of the long springs and at its rear end, while the other of eachtwo of said springs is placed underneath its long spring D or E, in theposition as seen in the drawings. Each of the said elliptic springs isfastened to one of four transverse timbers or bars K, L, M, N, which arearranged and supported by four vertical posts O, O, &c., which make partof the frame work P, of the machine, said framework being constructed inany suitable manner. The front ends of the long springs D, E, play ormove freely between two guide posts Q, R, of a vertical gallows frame.

A horizontal shaft S, disposed as seen in the drawings, has a bell crankT, to which the lower end of a connecting rod V is jointed, the saidconnecting rod being made to pass up through the lower spring E, or anelongated slot V made through the same. At the upper end of the saidconnecting rod it is jointed to the upper long spring D, and in suchmanner as to allow of the pendulous motion o-f the connecting rod,produced by the bell crank during the rotations of the shaft and crank.The said shaft may be put in revolution by any proper means. In thedrawings it is represented as having two pulleys W, W', on it, aroundeach of which an endless band X, is made to work, and also to work onanother pulley Y, o-r Y, fixed on a driving shaft Z.

The connecting rod U is made in two parts a., Z), which are connected bya swivel c, the said swivel being jointed to' the lower part b, andscrewed upon the upper part a, the same being for the purpose oflengthening or shortening the rod, and thereby diminishing or increasingthe downward pressure of the long springs on their elliptic springs. Thesaid two long springs D, E, are connected together by another andsimilar connecting rod A, which is situated as seen in the drawings, andis jointed to each ofthe long springs, and so as to allow and cause themand the drill holder to simultaneously move up and down when the crankshaft is put in revolution.

The above constitutes the mechanism for sustaining the drill andimparting to it its reciprocating vertical movements. That which givesto it a horizontalu rotation or movement on its vertical axis may bethus described.

On the drill holder A, a ratchet wheel Z is fixed, just underneath thelower long spring E. A long rod, pawl or pitman e, shaped in top view asseen in Fig. 5 is so fixed to the underside of the lower long spring El,as to be capable of being moved longitudinally back and forth, while oneend, with its end contiguous to the ratchet wheel, is made so to restagainst the teeth of the said ratchet wheel, that when drawn backward itwill slip over them, andwhen pushed forward will so act against them asto cause the wheel to be partially rotated.

The rear end of the rod or pawl is made with an eye f, and has one endof a spring g, attached to it, the other end of the said spring beingaffixed to the lower spring E, as seen in the drawing. The connectingrod U, passes through the eye f, the said eye being so made that whenthe connecting rod is moved forward or toward the drill, it shall becarried against the forward end o-f the eye, and made to crowd or movethe rod or pawl forward, so as to create a parg tial rotation of theratchet wheel and drill holder and drill. Vhen a rearward movement ofthe connecting rod takes place the retractive power of vthe spring g,causes the rod or pawl to be drawn backward.

Vhat I claim as my invention is The improvement or combination ofsprings for supporting and operating the drill, the said combinationconsisting of the l two long springs D, E, and the two elliptic rest myclaim on the above speciied combination of springs for working thedrill, as bymy combination I not only preserve the drill in a verticalline during its movements, but I avoid the disastrous effects which hasbeen usually produced on the machinery by the percussion or the blow ofthe drill.

In testimony whereof I have hereto set my signature this seventeenth dayof Oeton ber, A. D. 1848.

SAMUEL JACK, 2D. VVnesses:

EVA ABBOTT, DANIEL GATE.

